Grinding and polishing machine.



- No'.737 v,220. 'PATENTB'D'AUG; 25, 1903-;

' w. L. GODFREY&G.N. RIVERS.

GRINDING AND POLISHING MAGHINE. APPLICATION TILED JAN. 22, 1902.

N0 MODEL. 3 8HEETS-SHBBT 1.

WITNESSES: INVENTORS Attorneyo',

No. 131,220. 7 I .PATENTED AUG. 25,- 1903.;

' w. I, G-QEEEEY a; RIVERS.

' GRINDING; Am musmm MACHINE. AIRLIQA'HQR rmm JAR". 22. 1992.

no mum mums-sum 2.

umum

, mummnn WITNESSES:

I0 IODEL.

No. 737,220. PATENTED AUG. 25, 19-03.

w. L. GODFREY a; 0. N'. RIVERSi 1 GRINDING AND POLISHING MACHINE.

APPLICATION HL'ED JAN..22, 19oz.

- a snnn'rs-snzm a.

Q "I mm imniinimminl UNITED STATES WILLIAM L. GODFREY, OF BROOKLYN, ANDCHARLES N. RIVERS, OF NEW "in Patented 'Aug'ust 25, 1903.

PATENT OEEIOE. j 1

YORI N. Y., ASSIGNORS T0 GEORGE H. BOWERS, OF BROOKLYN, NEW

YORK.

GRINDING AND POLISHING MACHINE.

QPEGIFIGATION forming part of Letters Patent No. 737,220, dated August25, 1903.

I Application-filed January 22, 1902. Serial No. 90,743. v(No model.)

To a whom-it may concern: Y

Be it known that we, WILLIAM L. GODFREY,

residing in the borough of Brooklyn, city of New York, county of Kings,and CHARLES N. RIVERS, residing-in the city of NwYork, county of NewYork, State of New York, citizens of the United States, have inventedcertain new and useful Improvements in Grind ing and Polishing Machines;and we do hereby declare the following to be a'full, clear, and exactdescription ofthe invention, such as will enable others skilled in theart to which it appertains to make and use the same.

Our invention is an improvement in grinding and polishing machinesadapted particularly for grinding and polishing the plain surfaces ofmetal plates and similar articles;- and it consists in the novelfeatures hereinthe polishing-belt. Fig. 4 is a plan View of a portion ofthe belt, showing the polishing or outer face thereof. Fig. 5 is asimilar view of a portion of the belt, showing the in nor face of thesame. Figs. 6 and 7 are detail views of the mechanism for raising andlowering and adjusting the work-supporting table. Fig. 8 is a top planview of the worksupporting table. Fig. 9 is a vertical longitudinalsectional view of the same. Fig. 10 is a top plan view of thevertically-movable carriage which supports the table. Fig. 11 is anenlarged'perspective view-of the mechanism for oscillating the table. 5

Referring to the drawings, A represents the main frame of the machine,which is supported uponsuitable legs a and carries the working parts ofthe machine.

B B represent a pair of drums for carrying and driving thepolishing-belt. One of said drums is so mounted as to be adjustabletoward and from the other in order to hold the polishing-belt at theproper tension. the present instance I have shown the shaft 1) of thedrum Bmounted in pillow-blocks b rigidly secured to the frame Aof themachine. The shaft b of the drum B is mounted similarly inpillow-bl0cksb which are arranged to slide in the main frame, preferablyby having dovetailed portions engaging a suitable guiding-groove in theframe, (not shown,) an d each of said pillow-blocks b is provided withanadjusting-rod b extending through a bracket 12 secured to the frame Aandprovided with an adjusting-nut 12 as clearly shown in Fig. 1, for thepurpose of moving the drum B longitudinally of the ma chine to maintainthe polishing-beltat the 4 proper tension.

0 represents the polishing-belt, which is preferably of leather and maybe made in one piece or in the form of'a series ofbelts-having'conti'guous edges Orin any other usual or desired manner;The belt O is provided on its inner face with aseries of transverse barsc, arranged at regular intervals and extending, preferably, entirelyacross the full width of the belt. These bars preferably have theirforward edges beveled or rounded, as shown at 0, (see Fig. 3,) and forconvenience of reference we term these bars the friction-bars or pressure-bar's. The exterior face of the belt 0 is provided with-a series oftransversely-disposed bars, which for convenience of reference We termpolishing-bars and which are indicated by the letter 0 It is preferablethat these polishing-bars should not extend entirely across the face ofthe belt, and we prefer to arrange them in whatmay be termed staggeredarrangement, so that certain of said polishing-bars are in line withcertain portions of the belt, while other polishing-bars are arranged inline'with other longitudinal portions, the arrangement being such thatthe various pressure-barswill extend laterally, so as to be in line withall longitudinal portions ofthe belt. In securing the friction-bars andpressure-bars to the belt we prefer to place certain of thepressure-bars directly opposite each of the fric tion-bars and to secureboth to the belt by riveting entirely through the bolt the fri c-.

too

Lion-bar and the pressure bar or bars. To provide the necessarypolishingsurfaces, strips 0 of suitable material, such' as felt orwalrus leather, are applied to the belt, stretched over the variouspolishingbars, and riveted or otherwise secured to the belt on each sideof the polishing-bars. It is to be noted, however, that the polishingmaterial is not secured in any way to the polishingbars themselves.

Power is applied to one or both of the drums B B, as preferred. In thepresent instance the drum B only is driven, and the said drum isprovided on its periphery with projections 11 (see Fig. 1,) which mayconsist of one or more lugs, studs, or cross-bars, the said projectionsbeing arranged at intervals around the periphery, which intervalscorrespond exactly with the intervals between the friction-plates c ofthe polishing-belts. The arrangement is such that these projections willfall in directly in rear of the friction-platesc when the machine is inoperation, and will therefore insure the positive driving of thepolishing-belt and will prevent the slipping of the belt upon thedriving-drum. Power may be applied to the shaft 1) of the drum B in anydesired way.

D represents what we term a frictionplate supported by brackets dfromthe frame A and extending transversely of the machine directly over thework-supporting devices. This plate is provided with a hardened-steellower surface, and the forward transverse edge of the plate is rounded,as indicated at d, Fig. 1. As the polishing-belt is operated thefriction-bars c engage the lower face of the friction-plate D and holdthe polishing devices from upward movement during their passage over thearticle being polished.

E represents the work-supporting table, which is provided with suitabledevices for holding the work (not shown) and which is superimposed upona vertically-movable and vertically adjustable plate or carriage F.(Shown in detail in Fig. 10.) The devices for supporting, adjusting, andoperating the table include the following devices:

G G represent a pair of vertically-disposed slides, preferablydovetailed and engaging dovetailed guides g, bolted or otherwise securedto the frame A, preferably to transverse bars or webs A, extendingacross from one side of the frame A to the other. Each of these slidesis provided with a vertical rackbar g, which is engaged by a pinion h ona shaft H, extending longitudinally of the machine and provided with abeveled wheel h, meshing with a beveled wheel 0; on a shaft I, extendingthrough one of the side frames of the machine and provided with aratchetwheel 1', which is engaged bya pawl F. The shaft I is alsoprovided with a crank t or other suitable device for rotating. Each ofthe vertical slides G is provided at its upper end with a horizontal barG, (see Figs. 6 and 7,) and each of said bars G is provided, prefanismfor the purpose of leveling the carriage and table, the.

Mechanism is provided, as hereinafter described, for imparting motion tothe table E transversely of the polishing-belt and at the same timeswinging it into different angular positions'with respect thereto toprevent the formation of lines or grain in the plate or other articlebeing polished.

In order to reduce the friction between the table E and carriage F asmuch as possible, the upper face of the carriage F is preferablyprovided with the curved bearing-webs ff' and a central bearing-Web f inthe center of which is a transversely-extending slot f The lower face ofthe table E is provided with similar curved bearing-webs c e and acentral bearing-web (2 adapted to bear upon the corresponding parts ofthe supportingcarriage, and the table E is provided centrally with adownwardly-projecting pin or stud e, which engages the slot f in thecarriage F and is adapted to slide therein transversely of saidcarriage.

The table E is provided at one end with a lug or projection 6 lyingbetween two stop lugs or projections f connected with the carriage F andadapted to be engaged by the lug e of the table. We also providemechanism for moving the table E transversely, which is shown in Figs. 1and 2. 75 represents a bellcrank lever pivotally mounted on a bracket fsecured to one side of the carriage F and having one end provided with apivotal connection with the table E. In this instance the bell-cranklever is provided with a pin engaging an aperture in a bracket a,secured to one edge of the table E, adjacent to the end opposite thatwhich is provided with the lug e The other arm of the bell-crank isconnected by a balland socket joint with a connecting-rod 7c, extendingto a crankpin 1& on a wheel K, mounted on a shaft Z, extendingtransversely of the machine. By this means a transverse reciprocatorymovement is imparted to one end of the table E, the resulting movementsof the table being modified by the sliding of the pin 6 in the slotf andby the lug a coming into contact with the stop-lugs f Supposing a tableE to be in the position shown in Fig. 8, in which the full lines show itin one extreme of its movement, the first efiect of the return movementin the direction of the arrow would be to swing the table on its pivot 6until the lug e strikes the opposite stop-lug f", when the table will besubstantially in line with the frame of the machine. The furthermovement of the table in a direction of the arrow will cause the pin 6to travel across the slot f the table being in a position inclined tothe longitudinal axis of themachine. When the motion is reversed, theoperation above indicated will be repeated; It will thus be seen thatthe table not only oscillates upon its pivot, but in addition is movedbodily backward and forward across the carriage, thereby enabling thepolishing-belt to act over the entire surface of the article which isbeing polished and at such variations of angular positions as to avoidthe possibility of graining the surface of the article.

The following mechanism is provided for the purpose of supplying thepolishing-belt with emery, rouge, or other suitable abrading orpolishing material.

- M represents a hopper for containing the abrading or polishingmaterial, which is provided with a regulating-gate or cut-off m forregulating the quantity to be supplied to the polishing-belt.

N represents a conveying-belt carried by a drum L on the shaft Z, beforereferred to, and a drum L on a shaft Z, supported in brackets from theend of the frame A, the upper portion of the belt N passing under thehopper M and extending horizontally toward the table E. The hopper Misprovided with side plates m, which extend on each side of the belt N tothe table E to prevent,'as far as possible, the polishing material fromleaving the belt. The work-engaging portion of the polishing-belt C willengage the upper face of the belt N and take up the polishing materialtherefrom and carry it onto the surface which is being operated upon.The belt N is conveniently driven from a pulley b on the shaft b bymeans of a belt b passing around the crank-wheel K on the shaft Z.

In operation the plate or other article to be polished is placed on topof the table E and secured in position in'any desired way. The machineis started,and the work-supporting table is raised by means of themechanism heretofore described and operated by the crank i until theplate or other article is brought into contact with the polishing-pad onthe belt 0 with the desired pressure, it being held in such a positionby means of the pawl The polishing-pads will polish the surface of theplate or article, being supplied with abrading or polishing material, asbefore described, and the work-table and work will be given theoscillatory and lateral motion heretofore described, so as to preventlining or graining the plate.

The particular construction of the polish ing-belt is not specificallyclaimed herein, this subject-matter being reserved to be covered by asubsequentapplication for Letters Patent of the United States.

an endless belt having a portion contiguous thereto, a stationaryfriction-plate arranged on the opposite side of said belt from thework-table, said belt being provided with polishing means on the faceadjacent to theworktable, and provided on its opposite face with devicesattached thereto to engage said friction-plate and means for drivingsaid belt, substantially as described.

2. In a grinding and polishing machine, the

combination with the endless belt,supportingdrums therefor and drivingmechanism, of a work-table arranged adjacent to one face of jacent tothe other face, of said belt, opposite the work-table, said belt havingthe face adjacent to said plate provided with friction or pressure barsfor engaging said plate and provided on its opposite face. withpolishing means, substantially as described.

8. In a grinding and polishing machine, the

combination with an endless belt, supportingdrums therefor, and drivingmechanism, of a movable work-supporting table arranged adj acent to theoutside of said belt, a stationary friction-plate arranged adjacent tothe inner face of said belt and opposite said work-ta a portion of saidbelt, a plate arranged ad-' drums therefor and driving mechanism foradjacent to one face of a portion of said belt, a friction-platearranged adjacent to the other face of said belt, oppositesaid table,frictionbars arranged at intervals onthe face of said belt adjacent tosaid plate, polishing means one of said drums, of a work-table arrangedarranged on the other face of said belt, the

drum operated by said driving mechanism said friction-plate-engagingdevices of said belt, to positively drive said belt, substantially asdescribed. 4

5.v In a grinding and polishing machine, the combination with an endlesspolishing-belt, and driving mechanism therefor, of a carriage movabletoward and from said belt, mechanism for moving said carriage toward andfrom saidbelt, adjusting devices, for adjusting said carriage withrespect to said mechanism, a, table movably mounted upon said IIO beingprovided with devices for engaging carriage, and means for moving saidtable in:

a plane parallel to the plane of the carriage, substantially asdescribed.

6. In a grinding and polishing machine, the combination with'an endlesspolishing-belt and driving mechanism therefor, of a carriage arrangedbelow a face of the belt, mechanism for raising and lowering'saidcarriage, a table movably supported upon said carriage, said carriageand table having the one a pivot-pin engaging a slot in the other anddevices adjacent to one end of said table for limiting its oscillationupon said pivot-pin, substantially as described.

7. In a grinding and polishing machine, the combination with an endlesspolishing-belt, and driving mechanism therefor, of a carriage arrangedbelowa face of the belt, mechanism for raising and lowering saidcarriage, a table movably supported upon said carriage, said carriageand table having the one a pivot-pin engaging a slot in the other, saidcarriage and table also having the one a lng, and the other two stops,for engaging opposite sides of said lug, to limit the oscillation ofsaid table upon said pivot-pin, substantially as described.

8. In a grinding and polishing machine, the combination with an endlesspolishing-belt, of a carriage arranged below a face of said YVitnesses:

\V. L. MURRAY, FRANK R. WHITMAN.

